analysis_tms320_c55x_plus.c

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// SPDX-FileCopyrightText: 2014 montekki <i.matveychikov@milabs.ru>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <string.h>
#include <rz_types.h>
#include <rz_lib.h>
#include <rz_asm.h>
#include <rz_analysis.h>
 
ut32 get_ins_len(ut8 opcode);
 
int tms320_c55x_plus_op(RzAnalysis *analysis, RzAnalysisOp *op, ut64 addr, const ut8 *buf, int len) {
    ut16 *ins = (ut16 *)buf;
    ut32 ins_len;
 
    if (!buf || len <= 0) {
        return 0;
    }
 
    ins_len = get_ins_len(buf[0]);
    if (ins_len == 0) {
        return 0;
    }
 
    op->addr = addr;
    op->size = ins_len;
 
    if (ins_len == 1) {
        if (*ins == 0x20) {
            op->type = RZ_ANALYSIS_OP_TYPE_NOP;
        } else if (*ins == 0x21) {
            op->type = RZ_ANALYSIS_OP_TYPE_RET;
        }
    } else if (ins_len >= 4 && buf[0] == 0xD8) {
        //  BCC conditional absolute jump
        op->type = RZ_ANALYSIS_OP_TYPE_CJMP;
        op->jump = (buf[1] << 16) | (buf[2] << 8) | buf[3];
    } else if (ins_len >= 2 && buf[0] == 0x6A) {
        //  BCC conditional relative jump
        op->type = RZ_ANALYSIS_OP_TYPE_CJMP;
        op->jump = addr + ((st8)buf[1]) + ins_len;
    } else if (ins_len >= 3 && buf[0] == 0x9A) {
        // BCC conditional relative jump
        op->type = RZ_ANALYSIS_OP_TYPE_CJMP;
        op->jump = addr + (st16)((buf[1] << 8) | buf[2]) + ins_len;
    } else if (ins_len >= 4 && buf[0] == 0x9C) {
        // B unconditional absolute jump
        op->type = RZ_ANALYSIS_OP_TYPE_JMP;
        op->jump = (buf[1] << 16) | (buf[2] << 8) | buf[3];
    } else if (ins_len >= 3 && buf[0] == 0x68) {
        // B unconditional relative jump
        op->type = RZ_ANALYSIS_OP_TYPE_JMP;
        op->jump = addr + (st16)((buf[1] << 8) | buf[2]) + ins_len;
    } else if (ins_len == 2 && buf[0] == 0x02) {
        // CALL unconditional absolute call with acumulator register ACx
 
        op->type = RZ_ANALYSIS_OP_TYPE_UCALL;
        op->fail = addr + ins_len;
    } else if (ins_len >= 3 && buf[0] == 0x69) {
        // CALL unconditional relative call
        op->type = RZ_ANALYSIS_OP_TYPE_CALL;
        op->jump = addr + (st16)((buf[1] << 8) | buf[2]) + ins_len;
    } else if (ins_len >= 3 && buf[0] == 0x9D) {
        // CALL unconditional absolute call
        op->type = RZ_ANALYSIS_OP_TYPE_CALL;
        op->jump = (buf[1] << 16) | (buf[2] << 8) | buf[3];
    } else if (ins_len >= 3 && buf[0] == 0x9B) {
        // CALLCC conditional relative call
        op->type = RZ_ANALYSIS_OP_TYPE_CALL;
        op->jump = addr + (st16)((buf[1] << 8) | buf[2]) + ins_len;
    } else if (ins_len >= 4 && buf[0] == 0xD9) {
        // CALLCC conditional absolute call
        op->type = RZ_ANALYSIS_OP_TYPE_CALL;
        op->jump = (buf[1] << 16) | (buf[2] << 8) | buf[3];
    } else {
        op->type = RZ_ANALYSIS_OP_TYPE_UNK;
    }
    return op->size;
}